公开(公告)号：US20240027508A1

公开(公告)日：2024-01-25

申请号：US18128912

申请日：2023-03-30

Applicant: Texas Instruments Incorporated

Inventor： Aatish Chandak ,  Aravind Miriyala ,  Midhun Raveendran ,  Anand Hariraj Udupa ,  Raja Reddy Patukuri ,  Prabin Krishna Yadav

IPC: G01R31/00 ,  A61B5/053

CPC classification number: G01R31/002 ,  A61B5/053 ,  A61B2560/0223

Abstract: An example apparatus includes: calibration circuitry configured to determine a second current at a second terminal of a second impedance circuit based on a first parasitic capacitance, a first impedance value, a third impedance value, a first voltage, and a second voltage; determine a third voltage at a second terminal of a second impedance circuit based on the first parasitic capacitance, a second impedance value, the third impedance value, the second voltage, and the second current; and determine a second parasitic capacitance between the second terminal of the second impedance circuit and the second terminal of a fifth impedance circuit based on the second current, the third voltage, a third current at the second terminal of the fifth impedance circuit, and a fourth voltage at the second terminal of the fifth impedance circuit.